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[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_c / routines / rand.c
diff --git a/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_c/routines/rand.c b/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_c/routines/rand.c
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-/*
- *   This file is part of TISEAN
- *
- *   Copyright (c) 1998-2007 Rainer Hegger, Holger Kantz, Thomas Schreiber
- *
- *   TISEAN is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   TISEAN is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with TISEAN; if not, write to the Free Software
- *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- */
-/*Author: Rainer Hegger. Last modified: Feb 12, 2006 */
-/* Changes:
-   Sep 5, 2004 : add extern definition of check_alloc
-   Feb 12, 2006: add was_set to avoid multiple initialisations
-*/
-
-#define __RANDOM
-
-#ifndef        _STDLIB_H
-#include <stdlib.h>
-#endif
-
-#ifndef _LIMITS_H
-#include <limits.h>
-#endif
-
-#ifndef _MATH_H
-#include <math.h>
-#endif
-
-
-#ifndef M_PI
-#define M_PI 3.1415926535897932385E0
-#endif
-
-extern void check_alloc(void*);
-
-static unsigned long *rnd_array,rnd69,*rnd1279,factor;
-static unsigned long *nexti,rndtime,rndtime1,rndtime2,rndtime3,*next1279;
-static unsigned long t1279,t1279_1,t1279_2,t1279_3;
-static double lo_limit;
-static char rnd_init_was_set=0;
-
-void rnd_init(unsigned long iseed)
-{
-  int i;
-  unsigned long z,index;
-
-  if (rnd_init_was_set == 1)
-    return ;
-
-  rnd_init_was_set=1;
-
-  if (sizeof(long) == 8) {
-    factor=13*13*13*13;
-    factor=factor*factor*factor*13;
-  }
-  else
-    factor=69069;
-  lo_limit=(double)ULONG_MAX;
-
-  check_alloc(rnd_array=(unsigned long *)malloc(9689*sizeof(unsigned long)));
-  check_alloc(nexti=(unsigned long *)malloc(9689*sizeof(long)));
-  check_alloc(rnd1279=(unsigned long *)malloc(1279*sizeof(unsigned long)));
-  check_alloc(next1279=(unsigned long *)malloc(1279*sizeof(long)));
-
-  rnd_array[0]=rnd1279[0]=iseed;
-  rnd69=iseed;
-  index=iseed;
-  nexti[0]=next1279[0]=1;
-
-  for (i=1;i<9689;i++) {
-    rnd_array[i]=factor*rnd_array[i-1]+1;
-    nexti[i]=i+1;
-  }
-
-  for (i=1;i<1279;i++) {
-    rnd1279[i]=factor*rnd1279[i-1]+1;
-    next1279[i]=i+1;
-  }
-  nexti[9688]=next1279[1278]=0;
-
-  for (i=1;i<2000;i++) {
-    index=factor*index+1;
-    z=rnd1279[((index>>10)%1279)];
-    z=(z<<10)+(z>>10);
-    index=factor*index+1;
-    rnd1279[((index>>10)%1279)] += z;
-  }
-
-  nexti[9688]=next1279[1278]=0;
-  rndtime=9688;
-  rndtime1=9688-157;
-  rndtime2=9688-314;
-  rndtime3=9688-471;
-  t1279=1278;
-  t1279_1=1278-216;
-  t1279_2=1278-299;
-  t1279_3=1278-598;
-}
-
-unsigned long rnd_long(void)
-{
-  rndtime=nexti[rndtime];
-  rndtime1=nexti[rndtime1];
-  rndtime2=nexti[rndtime2];
-  rndtime3=nexti[rndtime3];
-  rnd_array[rndtime] ^= rnd_array[rndtime1]
-    ^rnd_array[rndtime2]^rnd_array[rndtime3];
-
-  return rnd_array[rndtime];
-}
-
-unsigned long rnd_1279(void)
-{
-  t1279=next1279[t1279];
-  t1279_1=next1279[t1279_1];
-  t1279_2=next1279[t1279_2];
-  t1279_3=next1279[t1279_3];
-
-  rnd1279[t1279] += (rnd1279[t1279_1] + rnd1279[t1279_2] 
-                    + rnd1279[t1279_3]);
-  return rnd1279[t1279];
-}
-
-unsigned long rnd69069(void)
-{
-  return (rnd69=rnd69*factor+1);
-}
-
-double gaussian(double sigma)
-{
-  static unsigned long gausscount=0;
-  double x,r,u,phi;
-  static double y;
-  
-  if (!(gausscount++ & 0x1)) {
-    phi=2.0*M_PI*(double)rnd_1279()/lo_limit;
-    u=(double)rnd_1279()/lo_limit;
-    r=sqrt(-2.0*sigma*sigma*log(u));
-    x=r*cos(phi);
-    y=r*sin(phi);
-
-    return x;
-  }
-  else
-    return y;
-}